Roller blind



FIG. 1 is a first perspective view of the first embodiment of a roller blind showing my new design;

FIG. 2 is a second perspective view of the first embodiment thereof;

FIG. 3 is a front view of the first embodiment thereof;

FIG. 4 is a back view of the first embodiment thereof;

FIG. 5 is a left side View of the first embodiment thereof;

FIG. 6 is a right side view of the first embodiment thereof;

FIG. 7 is a top view of the first embodiment thereof;

FIG. 8 is a bottom view of the, first embodiment thereof;

FIG. 9 is a first perspective view of the second embodiment of a roller blind showing my new design;

FIG. 10 is a second perspective view of the second embodiment thereof;

FIG. 11 is a front view of the second embodiment thereof;

FIG. 12 is a back view of the second embodiment thereof;

FIG. 13 is a left side view of the second embodiment thereof;

FIG. 14 is a right side view of the second embodiment thereof;

FIG. 15 is a top view of the second embodiment thereof; and,

FIG. 16 is a bottom view of the second embodiment thereof.

The broken lines shown in the drawings depict portions of the roller blind that form no part of the claimed design. 

CLAIM The ornamental design for a roller blind, as shown and described. 